Fractions


Subtracting Fractions with Unlike Denominators

When Fractions have Unlike Denominators, the Least Common Denominator must first be found.



2
3

+
1
5



2
3

=
10
15



1
5

=
3
15



10
15

-
3
15

=
7
15




With Like Denominators, the Numerators, can be added.

The sum of the Numerators becomes the new Numerator.

The Denominator remains the Least Common Denominator.






If the resulting Proper Fraction can be reduced, then do so.




5
6

-
1
3



5
6

-
2
6

=
3
6



3
6

=
1
2





RULE

Subtracting Fractions with Unlike Denominators


First change the Unlike Denominators to Like Denominators.

Subtract the Numerators. Keep the Common Denominator.

If the Proper Fraction can be Reduced, then do so.